黄原胶和木质素纤维改良粉砂土抗压强度特性及微观机理分析  

Analysis of Compressive Strength Characteristics and Microscopic Mechanism of Silty Soil Improved by Xanthan Gum and Lignin Fiber

作　　者：王浩[1] 付德伟 郭剑波 晏田田 宋昊明 WANG Hao;FU De-wei;GUO Jian-bo;YAN Tian-tian;SONG Hao-ming(School of Civil Engineering and Architecture,Henan University,Kaifeng 475004,China)

机构地区：[1]河南大学建筑工程学院,开封475004

出　　处：《科学技术与工程》2025年第4期1602-1612,共11页Science Technology and Engineering

基　　金：河南省科技攻关计划(242102321007,232102321012)。

摘　　要：为改良黄泛区粉砂土强度低、易变形,黏结能力差的工程特性,采用力学测试和扫描电镜(scanning electron microscope, SEM),对加入不同含量的黄原胶(xanthan gum, XG)、木质素纤维(lignin fiber, LF)和养护龄期作用下的力学性能和改良机理进行研究。结果表明:XG和LF作为改良材料均可提高粉砂土的抗压强度;XG掺量的增加,粉砂土抗压强度呈现先增大后减小趋势;LF含量的提高,粉砂土的抗压强度随之增大,过量地加入LF会削弱改良效果;当在粉砂土中同时加入两者材料,粉砂土的抗压强度较单独添加其中1种材料都有不同程度的提高;XG遇水产生高黏性凝胶,松散的粉砂土被紧紧胶结在一起,土体强度得到提高;LF内部含有大分子集团,与周围土颗粒形成空间网状结构,加强了土体间的联合力。研究成果可为黄泛区粉砂土路基改良工程提供参考性数值。In order to improve the engineering characteristics of silty soil in yellow plain area with low strength,easy deformation and poor bonding ability,mechanical testing and scanning electron microscope(SEM)were used to add different contents of xanthan gum(XG),The mechanical properties and improvement mechanism of XG,lignin fiber(LF)and curing age were studied.The results show that both XG and LF as improved materials can increase the compressive strength of silty sand.With the increase of XG content,the compressive strength of silty sand first increases and then decreases.With the increase of LF content,the compressive strength of silt will increase,and the improvement effect will be weakened by adding too much LF.When the two materials are added to the silt simultaneously,the compressive strength of the silt is higher than that of one material alone.XG produces high viscosity gel when it encounters water,the loose silty soil is tightly cemented together,and the strength of the soil is improved.LF contains large molecular groups,forming a spatial network structure with surrounding soil particles,which strengthens the joint force between soils.The research results can provide reference values for the silty soil subgrade improvement project in the yellow plain area.

关 键 词：粉砂土 改良 抗压强度 黄原胶(XG) 木质素纤维(LF) 微观结构 

分 类 号：TU411.6[建筑科学—岩土工程]